ci starts bisection 2024-06-29 23:08:47.405114287 +0000 UTC m=+98797.096280760 bisecting cause commit starting from a12978712d9001b060bcc10eaae42ad5102abe2b building syzkaller on 757f06b1fadfe22cb3ac5f4f36e8e894eb78bb08 ensuring issue is reproducible on original commit a12978712d9001b060bcc10eaae42ad5102abe2b testing commit a12978712d9001b060bcc10eaae42ad5102abe2b gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 655a9dc46d2fe4067476c11d0aefae57aa44de1f8d5338c9ce75e9dc29034dda all runs: crashed: possible deadlock in __mmap_lock_do_trace_released representative crash: possible deadlock in __mmap_lock_do_trace_released, types: [LOCKDEP] check whether we can drop unnecessary instrumentation disabling configs for [KASAN ATOMIC_SLEEP HANG LEAK UBSAN BUG], they are not needed testing commit a12978712d9001b060bcc10eaae42ad5102abe2b gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 539f37db4f8788ee2449fd521ac383522796bbb30e3c361ceff31e5c80c601a5 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] the bug reproduces without the instrumentation disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN], they are not needed kconfig minimization: base=3998 full=8043 leaves diff=2006 split chunks (needed=false): <2006> split chunk #0 of len 2006 into 5 parts testing without sub-chunk 1/5 disabling configs for [UBSAN BUG KASAN ATOMIC_SLEEP HANG LEAK], they are not needed testing commit a12978712d9001b060bcc10eaae42ad5102abe2b gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 685ae3d59def1cf75efef2fad884bbe49b16a70c778fce13f6b4781e851eebcb all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN], they are not needed testing commit a12978712d9001b060bcc10eaae42ad5102abe2b gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4a3248d83de510a73d35c741fc784d3d57189b0bf5b69b1a25936b66db1d80ac all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [HANG LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed testing commit a12978712d9001b060bcc10eaae42ad5102abe2b gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: d374d945e6cf8001f5c9a1e15e46e2d0133f13be436bfc37f807385844207f47 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [BUG KASAN ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit a12978712d9001b060bcc10eaae42ad5102abe2b gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: fb9ad43faea4c602b43c9bfc7bc60d81d08008e7a68ce2d486ee84b6a42ae8d8 all runs: OK false negative chance: 0.000 testing without sub-chunk 5/5 disabling configs for [BUG KASAN ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit a12978712d9001b060bcc10eaae42ad5102abe2b gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 011eb6c1115a5aaa857148ac2f538828055b5e98880ba2a0ba57a776b386392c all runs: OK false negative chance: 0.000 minimized to 800 configs; suspects: [AF_RXRPC ARCH_ENABLE_MEMORY_HOTREMOVE ATM AX25 BCMA BLK_DEV_ZONED BPF_SYSCALL CARDBUS CFG80211 CFG80211_WEXT CMA COMMON_CLK CONTIG_ALLOC CRYPTO_842 CRYPTO_LZ4 CRYPTO_LZ4HC CRYPTO_ZSTD DAX DLM DVB_CORE ENCRYPTED_KEYS EXTCON FB GENEVE GPIOLIB HAMRADIO HAVE_CLK HID_SENSOR_HUB HID_SMARTJOYPLUS HID_THRUSTMASTER HID_ZEROPLUS I2C_MUX IIO INFINIBAND INFINIBAND_ADDR_TRANS INFINIBAND_IPOIB INFINIBAND_USER_ACCESS INFINIBAND_VIRT_DMA INPUT_TABLET INPUT_TOUCHSCREEN IOMMUFD IP_SCTP IRQ_REMAP KVM KVM_INTEL L2TP LIBNVDIMM MEDIA_ANALOG_TV_SUPPORT MEDIA_CAMERA_SUPPORT MEDIA_CEC_SUPPORT MEDIA_COMMON_OPTIONS MEDIA_CONTROLLER MEDIA_DIGITAL_TV_SUPPORT MEDIA_RADIO_SUPPORT MEDIA_SDR_SUPPORT MEDIA_SUPPORT MEDIA_TEST_SUPPORT MEDIA_USB_SUPPORT MEMORY_HOTPLUG MEMORY_HOTREMOVE MFD_DLN2 MFD_RETU MFD_VIPERBOARD MMC MTD MTD_UBI NETFILTER_CONNCOUNT NET_IPGRE NET_IPGRE_DEMUX NFS_V4_1 NF_TPROXY_IPV6 NILFS2_FS NLMON NLS_CODEPAGE_1250 NLS_CODEPAGE_1251 NLS_CODEPAGE_737 NLS_CODEPAGE_775 NLS_CODEPAGE_850 NLS_CODEPAGE_852 NLS_CODEPAGE_855 NLS_CODEPAGE_857 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USB_SERIAL_XSENS_MT USB_SEVSEG USB_SI470X USB_SI4713 USB_SIERRA_NET USB_SISUSBVGA USB_SL811_CS USB_SL811_HCD USB_SL811_HCD_ISO USB_SNP_CORE USB_SPEEDTOUCH USB_STORAGE_ALAUDA USB_STORAGE_CYPRESS_ATACB USB_STORAGE_DATAFAB USB_STORAGE_ENE_UB6250 USB_STORAGE_FREECOM USB_STORAGE_ISD200 USB_STORAGE_JUMPSHOT USB_STORAGE_KARMA USB_STORAGE_ONETOUCH USB_STORAGE_REALTEK USB_STORAGE_SDDR09 USB_STORAGE_SDDR55 USB_STORAGE_USBAT USB_STV06XX USB_TEST USB_TMC USB_TRANCEVIBRATOR USB_UAS USB_UEAGLEATM USB_ULPI_BUS USB_USBNET USB_USS720 USB_U_AUDIO USB_U_ETHER USB_U_SERIAL USB_VIDEO_CLASS USB_VIDEO_CLASS_INPUT_EVDEV USB_VL600 USB_WDM USB_XHCI_DBGCAP USB_XHCI_PLATFORM USB_XUSBATM USB_YUREX USERFAULTFD USERIO USERMODE_DRIVER USER_RETURN_NOTIFIER UVC_COMMON U_SERIAL_CONSOLE V4L2_MEM2MEM_DEV V4L_TEST_DRIVERS VALIDATE_FS_PARSER VDPA VDPA_SIM VDPA_SIM_BLOCK VDPA_SIM_NET VDPA_USER VETH VFIO VFIO_DEVICE_CDEV VFIO_PCI VFIO_PCI_CORE VFIO_PCI_INTX VFIO_PCI_MMAP VFIO_VIRQFD VGASTATE VHOST VHOST_CROSS_ENDIAN_LEGACY VHOST_IOTLB VHOST_NET VHOST_RING VHOST_TASK VHOST_VDPA VHOST_VSOCK VIDEO VIDEOBUF2_CORE VIDEOBUF2_DMA_CONTIG VIDEOBUF2_DMA_SG VIDEOBUF2_MEMOPS VIDEOBUF2_V4L2 VIDEOBUF2_VMALLOC VIDEOMODE_HELPERS VIDEO_AU0828 VIDEO_AU0828_RC VIDEO_AU0828_V4L2 VIDEO_CS53L32A VIDEO_CX231XX VIDEO_CX231XX_ALSA VIDEO_CX231XX_DVB VIDEO_CX231XX_RC VIDEO_CX2341X VIDEO_CX25840 VIDEO_DEV VIDEO_EM28XX VIDEO_EM28XX_ALSA VIDEO_EM28XX_DVB VIDEO_EM28XX_RC VIDEO_EM28XX_V4L2 VIDEO_GO7007 VIDEO_GO7007_LOADER VIDEO_GO7007_USB VIDEO_GO7007_USB_S2250_BOARD VIDEO_HDPVR VIDEO_MSP3400 VIDEO_PVRUSB2 VIDEO_PVRUSB2_DVB VIDEO_PVRUSB2_SYSFS VIDEO_SAA711X VIDEO_STK1160 VIDEO_TUNER VIDEO_TVEEPROM VIDEO_USBTV VIDEO_V4L2_I2C VIDEO_V4L2_SUBDEV_API VIDEO_V4L2_TPG VIDEO_VICODEC VIDEO_VIM2M VIDEO_VIMC VIDEO_VIVID VIDEO_VIVID_CEC VIDEO_WM8775 VIPERBOARD_ADC VIRTIO_BALLOON VIRTIO_DMA_SHARED_BUFFER VIRTIO_MEM VIRTIO_MMIO VIRTIO_MMIO_CMDLINE_DEVICES VIRTIO_PMEM VIRTIO_VDPA VIRTIO_VSOCKETS VIRTIO_VSOCKETS_COMMON VIRT_WIFI VLAN_8021Q VLAN_8021Q_GVRP VLAN_8021Q_MVRP VMAP_PFN VMWARE_VMCI VMXNET3 VP_VDPA VSOCKETS VSOCKETS_DIAG VSOCKETS_LOOPBACK VSOCKMON VT_HW_CONSOLE_BINDING VXFS_FS VXLAN WANT_DEV_COREDUMP WEXT_CORE WEXT_PRIV WEXT_PROC WIREGUARD WIRELESS WIRELESS_EXT WLAN WLAN_VENDOR_ADMTEK WLAN_VENDOR_PURELIFI WLAN_VENDOR_SILABS X86_SGX X86_SGX_KVM X86_USER_SHADOW_STACK X86_X2APIC X86_X32_ABI XDP_SOCKETS XDP_SOCKETS_DIAG XFRM_ESPINTCP XFRM_INTERFACE XFRM_IPCOMP XFRM_MIGRATE XFRM_OFFLOAD XFRM_STATISTICS XFRM_SUB_POLICY XFRM_USER_COMPAT XFS_FS XFS_POSIX_ACL XFS_QUOTA XFS_RT XOR_BLOCKS YENTA YENTA_ENE_TUNE YENTA_O2 YENTA_RICOH YENTA_TI YENTA_TOSHIBA ZEROPLUS_FF ZLIB_DEFLATE ZONEFS_FS ZONE_DEVICE ZPOOL ZRAM ZRAM_DEF_COMP_LZORLE ZSMALLOC ZSTD_COMPRESS ZSWAP ZSWAP_COMPRESSOR_DEFAULT_LZO ZSWAP_DEFAULT_ON ZSWAP_SHRINKER_DEFAULT_ON ZSWAP_ZPOOL_DEFAULT_ZSMALLOC] disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN], they are not needed picked [v6.9 v6.8 v6.7 v6.5 v6.3 v6.1 v5.19 v5.17 v5.14 v5.11 v5.8 v5.5 v5.2 v4.20 v4.19] out of 32 release tags testing release v6.9 testing commit a38297e3fb012ddfa7ce0321a7e5a8daeb1872b6 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 1797a81812ea1311b0eda4fc9539e6a65e2db1c996c7ea95407fefff433eddec all runs: OK false negative chance: 0.000 # git bisect start a12978712d9001b060bcc10eaae42ad5102abe2b a38297e3fb012ddfa7ce0321a7e5a8daeb1872b6 Bisecting: 6814 revisions left to test after this (roughly 13 steps) [d34672777da3ea919e8adb0670ab91ddadf7dea0] Merge tag 'fbdev-for-6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/linux-fbdev testing commit d34672777da3ea919e8adb0670ab91ddadf7dea0 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 5d45564718841fb6b1ee2a4779798228e2aba77ba58f844ed568739a15f6e64b all runs: OK false negative chance: 0.000 # git bisect good d34672777da3ea919e8adb0670ab91ddadf7dea0 Bisecting: 3357 revisions left to test after this (roughly 12 steps) [119d1b8a5d49138b151d3450ceb207dc439f7085] Merge tag 'xfs-6.10-merge-6' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux testing commit 119d1b8a5d49138b151d3450ceb207dc439f7085 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a56884acbbe6255d128cd94f47ccc584b3de0078a26916e9c695ff42cda699d8 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect bad 119d1b8a5d49138b151d3450ceb207dc439f7085 Bisecting: 1723 revisions left to test after this (roughly 11 steps) [06f054b1fee83415fe35204845708988fc16ef22] Merge tag 'devicetree-for-6.10' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux testing commit 06f054b1fee83415fe35204845708988fc16ef22 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: aa7f67a9b7cd8daef49d7612b06a332122c2340d31c7cb3ba4581573329c7679 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect bad 06f054b1fee83415fe35204845708988fc16ef22 Bisecting: 754 revisions left to test after this (roughly 10 steps) [f4b0c4b508364fde023e4f7b9f23f7e38c663dfe] Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm testing commit f4b0c4b508364fde023e4f7b9f23f7e38c663dfe gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 87feac099f7971785c5b1c74f59060572521c5a18bee6be58b8a84c7a6ac435e all runs: OK false negative chance: 0.000 # git bisect good f4b0c4b508364fde023e4f7b9f23f7e38c663dfe Bisecting: 377 revisions left to test after this (roughly 9 steps) [6fd600d742744dc7ef7fc65ca26daa2b1163158a] Merge tag 'media/v6.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media testing commit 6fd600d742744dc7ef7fc65ca26daa2b1163158a gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 5d4dfc57afbe29647cac036869b28890be6e4d4433c0f5107a2d0892eff4a560 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect bad 6fd600d742744dc7ef7fc65ca26daa2b1163158a Bisecting: 188 revisions left to test after this (roughly 8 steps) [f468ff16f5524cdccf182a1fa7c0558421d2acbc] media: atomisp: Drop custom flash support testing commit f468ff16f5524cdccf182a1fa7c0558421d2acbc gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 5f010d45a3cb8d9a490cdfbd2df33a8e2a16b6f7673a13663271f26c930d4e1c all runs: OK false negative chance: 0.000 # git bisect good f468ff16f5524cdccf182a1fa7c0558421d2acbc Bisecting: 94 revisions left to test after this (roughly 7 steps) [79390f965be77dbe13eaa5745e6f94623ba30627] media: bcm2835-unicam: Include v4l2-subdev.h testing commit 79390f965be77dbe13eaa5745e6f94623ba30627 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 2cd5db7e26e7ba6236dc5636bdd5cb705aebc3231ca118dec8f5060640f7d587 all runs: OK false negative chance: 0.000 # git bisect good 79390f965be77dbe13eaa5745e6f94623ba30627 Bisecting: 47 revisions left to test after this (roughly 6 steps) [4ff61c4ce93677cd94a0ddefbd6f3bc3c40457c4] media: intel/ipu6: Don't print user-triggerable errors to kernel log testing commit 4ff61c4ce93677cd94a0ddefbd6f3bc3c40457c4 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a310d0db92409e066df164b67dc36a624f648c26574dbfaf6cfcbef642aae4ad all runs: OK false negative chance: 0.000 # git bisect good 4ff61c4ce93677cd94a0ddefbd6f3bc3c40457c4 Bisecting: 23 revisions left to test after this (roughly 5 steps) [21c38a3bd4ee3fb7337d013a638302fb5e5f9dc2] cgroup/rstat: add cgroup_rstat_cpu_lock helpers and tracepoints testing commit 21c38a3bd4ee3fb7337d013a638302fb5e5f9dc2 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 98150f51a5ad122039435e99ee19cf7e3e2ed7622928272424d9d504edfb52c4 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect bad 21c38a3bd4ee3fb7337d013a638302fb5e5f9dc2 Bisecting: 11 revisions left to test after this (roughly 4 steps) [f71bfbe1e281a707e7766eb0a59ba056dc0f29f9] cgroup, legacy_freezer: update comment for freezer_css_offline() testing commit f71bfbe1e281a707e7766eb0a59ba056dc0f29f9 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: bf37967b4a0cad86bd75a430ddabb62f102cc65e7f6a5ce4df2f823f4f35b551 all runs: OK false negative chance: 0.000 # git bisect good f71bfbe1e281a707e7766eb0a59ba056dc0f29f9 Bisecting: 5 revisions left to test after this (roughly 3 steps) [1da2363228d68da266443e7a85fa91edc2be3dac] selftests/cgroup: fix clang build failures for abs() calls testing commit 1da2363228d68da266443e7a85fa91edc2be3dac gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 172184da33a91336e9c594e369045e7ae29a659522a687b709f474947ec125c1 all runs: OK false negative chance: 0.000 # git bisect good 1da2363228d68da266443e7a85fa91edc2be3dac Bisecting: 2 revisions left to test after this (roughly 2 steps) [8f6d24a5db2acac3f52a34e6df347ec131d231ab] selftests/cgroup: fix uninitialized variables in test_zswap.c testing commit 8f6d24a5db2acac3f52a34e6df347ec131d231ab gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4f0d657dbf1e3c1b78a30da7291d9ce29bd45c037fa3a506778cf92596f979c7 all runs: OK false negative chance: 0.000 # git bisect good 8f6d24a5db2acac3f52a34e6df347ec131d231ab Bisecting: 0 revisions left to test after this (roughly 1 step) [c1457d9aad5ee2feafcf85aa9a58ab50500159d2] selftests/cgroup: Drop define _GNU_SOURCE testing commit c1457d9aad5ee2feafcf85aa9a58ab50500159d2 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: c0534c157b9ee2842788093854c3fa1a7f1e6597eddba422d721971ae1a47aea all runs: OK false negative chance: 0.000 # git bisect good c1457d9aad5ee2feafcf85aa9a58ab50500159d2 21c38a3bd4ee3fb7337d013a638302fb5e5f9dc2 is the first bad commit commit 21c38a3bd4ee3fb7337d013a638302fb5e5f9dc2 Author: Jesper Dangaard Brouer Date: Wed May 1 16:04:11 2024 +0200 cgroup/rstat: add cgroup_rstat_cpu_lock helpers and tracepoints This closely resembles helpers added for the global cgroup_rstat_lock in commit fc29e04ae1ad ("cgroup/rstat: add cgroup_rstat_lock helpers and tracepoints"). This is for the per CPU lock cgroup_rstat_cpu_lock. Based on production workloads, we observe the fast-path "update" function cgroup_rstat_updated() is invoked around 3 million times per sec, while the "flush" function cgroup_rstat_flush_locked(), walking each possible CPU, can see periodic spikes of 700 invocations/sec. For this reason, the tracepoints are split into normal and fastpath versions for this per-CPU lock. Making it feasible for production to continuously monitor the non-fastpath tracepoint to detect lock contention issues. The reason for monitoring is that lock disables IRQs which can disturb e.g. softirq processing on the local CPUs involved. When the global cgroup_rstat_lock stops disabling IRQs (e.g converted to a mutex), this per CPU lock becomes the next bottleneck that can introduce latency variations. A practical bpftrace script for monitoring contention latency: bpftrace -e ' tracepoint:cgroup:cgroup_rstat_cpu_lock_contended { @start[tid]=nsecs; @cnt[probe]=count()} tracepoint:cgroup:cgroup_rstat_cpu_locked { if (args->contended) { @wait_ns=hist(nsecs-@start[tid]); delete(@start[tid]);} @cnt[probe]=count()} interval:s:1 {time("%H:%M:%S "); print(@wait_ns); print(@cnt); clear(@cnt);}' Signed-off-by: Jesper Dangaard Brouer Signed-off-by: Tejun Heo include/trace/events/cgroup.h | 56 ++++++++++++++++++++++++++++++---- kernel/cgroup/rstat.c | 70 +++++++++++++++++++++++++++++++++++-------- 2 files changed, 108 insertions(+), 18 deletions(-) accumulated error probability: 0.00 culprit signature: 98150f51a5ad122039435e99ee19cf7e3e2ed7622928272424d9d504edfb52c4 parent signature: c0534c157b9ee2842788093854c3fa1a7f1e6597eddba422d721971ae1a47aea revisions tested: 21, total time: 8h6m11.974678241s (build: 4h24m12.008124736s, test: 3h25m53.858965523s) first bad commit: 21c38a3bd4ee3fb7337d013a638302fb5e5f9dc2 cgroup/rstat: add cgroup_rstat_cpu_lock helpers and tracepoints recipients (to): ["hawk@kernel.org" "linux-trace-kernel@vger.kernel.org" "mhiramat@kernel.org" "rostedt@goodmis.org" "tj@kernel.org"] recipients (cc): ["cgroups@vger.kernel.org" "hannes@cmpxchg.org" "linux-kernel@vger.kernel.org" "lizefan.x@bytedance.com" "mathieu.desnoyers@efficios.com" "tj@kernel.org"] crash: possible deadlock in __mmap_lock_do_trace_acquire_returned ============================================ WARNING: possible recursive locking detected 6.9.0-rc1-syzkaller #0 Not tainted -------------------------------------------- syz-executor/4691 is trying to acquire lock: ffff88813bd2c320 (lock#9){+.+.}-{2:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline] ffff88813bd2c320 (lock#9){+.+.}-{2:2}, at: __mmap_lock_do_trace_acquire_returned+0x3e/0x200 mm/mmap_lock.c:237 but task is already holding lock: ffff88813bd2c320 (lock#9){+.+.}-{2:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline] ffff88813bd2c320 (lock#9){+.+.}-{2:2}, at: __mmap_lock_do_trace_acquire_returned+0x3e/0x200 mm/mmap_lock.c:237 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(lock#9); lock(lock#9); *** DEADLOCK *** May be due to missing lock nesting notation 5 locks held by syz-executor/4691: #0: ffff88810c8bf360 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline] #0: ffff88810c8bf360 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5631 [inline] #0: ffff88810c8bf360 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x25/0x130 mm/memory.c:5691 #1: ffff88813bd2c320 (lock#9){+.+.}-{2:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline] #1: ffff88813bd2c320 (lock#9){+.+.}-{2:2}, at: __mmap_lock_do_trace_acquire_returned+0x3e/0x200 mm/mmap_lock.c:237 #2: ffffffff83f8a910 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #2: ffffffff83f8a910 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #2: ffffffff83f8a910 (rcu_read_lock){....}-{1:2}, at: get_memcg_path_buf mm/mmap_lock.c:139 [inline] #2: ffffffff83f8a910 (rcu_read_lock){....}-{1:2}, at: get_mm_memcg_path+0x3d/0x2c0 mm/mmap_lock.c:209 #3: ffffffff83f8a910 (rcu_read_lock){....}-{1:2}, at: trace_call_bpf+0x4b/0x3d0 #4: ffff88810c8bf360 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline] #4: ffff88810c8bf360 (&mm->mmap_lock){++++}-{3:3}, at: stack_map_get_build_id_offset+0xb5/0x360 kernel/bpf/stackmap.c:141 stack backtrace: CPU: 1 PID: 4691 Comm: syz-executor Not tainted 6.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xa3/0x100 lib/dump_stack.c:114 check_deadlock kernel/locking/lockdep.c:3062 [inline] validate_chain kernel/locking/lockdep.c:3856 [inline] __lock_acquire+0x10bf/0x2490 kernel/locking/lockdep.c:5137 lock_acquire+0xeb/0x270 kernel/locking/lockdep.c:5754 local_lock_acquire include/linux/local_lock_internal.h:29 [inline] __mmap_lock_do_trace_acquire_returned+0x56/0x200 mm/mmap_lock.c:237 __mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline] mmap_read_trylock include/linux/mmap_lock.h:166 [inline] stack_map_get_build_id_offset+0x252/0x360 kernel/bpf/stackmap.c:141 __bpf_get_stack+0x1d7/0x240 kernel/bpf/stackmap.c:449 ___bpf_prog_run+0x5f6/0x2280 kernel/bpf/core.c:1997 __bpf_prog_run32+0xbb/0xe0 kernel/bpf/core.c:2236 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] bpf_prog_run_array include/linux/bpf.h:2073 [inline] trace_call_bpf+0x164/0x3d0 kernel/trace/bpf_trace.c:147 perf_trace_run_bpf_submit+0x3b/0xa0 kernel/events/core.c:10161 perf_trace_mmap_lock_acquire_returned+0x141/0x170 include/trace/events/mmap_lock.h:52 trace_mmap_lock_acquire_returned include/trace/events/mmap_lock.h:52 [inline] __mmap_lock_do_trace_acquire_returned+0x1e1/0x200 mm/mmap_lock.c:237 __mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline] mmap_read_trylock include/linux/mmap_lock.h:166 [inline] get_mmap_lock_carefully mm/memory.c:5631 [inline] lock_mm_and_find_vma+0xea/0x130 mm/memory.c:5691 do_user_addr_fault arch/x86/mm/fault.c:1385 [inline] handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x1a0/0x730 arch/x86/mm/fault.c:1563 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7fc4fb3cc9f0 Code: Unable to access opcode bytes at 0x7fc4fb3cc9c6. RSP: 002b:00007fffc6e920a8 EFLAGS: 00010202 RAX: 00007fc4fb3cc9f0 RBX: 0000000000000000 RCX: 00007fc4fa5748a0 RDX: 0000001b32520000 RSI: 00007fffc6e920c0 RDI: 0000000000000001 RBP: 00007fffc6e92230 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000032 R13: 0000000000001388 R14: 00007fffc6e923b0 R15: 00007fffc6e923b0